Koco Koga is a character in Black Streak’s comedy manga Fiji Random (FR). She is the best friend of the main character, Fiji, and she is very smart. By smart I mean book smart. She has tip top grades in her class but she lacks common sense. She’s not smart when it comes to real world stuff and this makes her look like an airhead to people who don’t know her well. Koco is lousy at solving riddles. Fiji knows this very well and asks her to solve them all the time to get a rise out out of her.